Robo callin phishing my system I think

Hi, something seems to be calling and trying to get into my system and I do not know how to stop it. Below is a piece of my log file where you can see this activity. Any pointers appreciated. thanks!
[Jan 10 21:06:38] VERBOSE[2929] netsock.c: == Using SIP RTP TOS bits 184
[Jan 10 21:06:38] VERBOSE[2929] netsock.c: == Using SIP RTP CoS mark 5
[Jan 10 21:06:38] VERBOSE[3962] pbx.c: – Executing [[email protected]:1] Set(“SIP/xxx.xxx.xxx.xxx-0000114f”, “__FROM_DID=50011972598601692”) in new stack
[Jan 10 21:06:38] VERBOSE[3962] pbx.c: – Executing [[email protected]:2] NoOp(“SIP/xxx.xxx.xxx.xxx-0000114f”, “Received an unknown call with DID set to 50011972598601692”) in new stack
[Jan 10 21:06:38] VERBOSE[3962] pbx.c: – Executing [[email protected]:3] Goto(“SIP/xxx.xxx.xxx.xxx-0000114f”, “s,a2”) in new stack
[Jan 10 21:06:38] VERBOSE[3962] pbx.c: – Goto (from-pstn,s,2)
[Jan 10 21:06:38] VERBOSE[3962] pbx.c: – Executing [[email protected]:2] Answer(“SIP/xxx.xxx.xxx.xxx-0000114f”, “”) in new stack
[Jan 10 21:06:39] VERBOSE[3962] pbx.c: == Spawn extension (from-pstn, s, 2) exited non-zero on ‘SIP/xxx.xxx.xxx.xxx-0000114f’
[Jan 10 21:06:39] VERBOSE[3962] pbx.c: – Executing [[email protected]:1] Hangup(“SIP/xxx.xxx.xxx.xxx-0000114f”, “”) in new stack
[Jan 10 21:06:39] VERBOSE[3962] pbx.c: == Spawn extension (from-pstn, h, 1) exited non-zero on ‘SIP/xxx.xxx.xxx.xxx-0000114f’
[Jan 10 21:06:57] VERBOSE[2929] netsock.c: == Using SIP RTP TOS bits 184
[Jan 10 21:06:57] VERBOSE[2929] netsock.c: == Using SIP RTP CoS mark 5
[Jan 10 21:06:57] VERBOSE[3974] pbx.c: – Executing [[email protected]:1] Set(“SIP/xxx.xxx.xxx.xxx-00001150”, “__FROM_DID=011441599690613”) in new stack
[Jan 10 21:06:57] VERBOSE[3974] pbx.c: – Executing [[email protected]:2] NoOp(“SIP/xxx.xxx.xxx.xxx-00001150”, “Received an unknown call with DID set to 011441599690613”) in new stack
[Jan 10 21:06:57] VERBOSE[3974] pbx.c: – Executing [[email protected]:3] Goto(“SIP/xxx.xxx.xxx.xxx-00001150”, “s,a2”) in new stack
[Jan 10 21:06:57] VERBOSE[3974] pbx.c: – Goto (from-pstn,s,2)
[Jan 10 21:06:57] VERBOSE[3974] pbx.c: – Executing [[email protected]:2] Answer(“SIP/xxx.xxx.xxx.xxx-00001150”, “”) in new stack
[Jan 10 21:06:57] VERBOSE[3974] pbx.c: == Spawn extension (from-pstn, s, 2) exited non-zero on ‘SIP/xxx.xxx.xxx.xxx-00001150’
[Jan 10 21:06:57] VERBOSE[3974] pbx.c: – Executing [[email protected]:1] Hangup(“SIP/xxx.xxx.xxx.xxx-00001150”, “”) in new stack
[Jan 10 21:06:57] VERBOSE[3974] pbx.c: == Spawn extension (from-pstn, h, 1) exited non-zero on ‘SIP/xxx.xxx.xxx.xxx-00001150’
[Jan 10 21:07:01] VERBOSE[2929] netsock.c: == Using SIP RTP TOS bits 184
[Jan 10 21:07:01] VERBOSE[2929] netsock.c: == Using SIP RTP CoS mark 5
[Jan 10 21:07:01] VERBOSE[3979] pbx.c: – Executing [[email protected]:1] Set(“SIP/xxx.xxx.xxx.xxx-00001151”, “__FROM_DID=9011441599690613”) in new stack
[Jan 10 21:07:01] VERBOSE[3979] pbx.c: – Executing [[email protected]:2] NoOp(“SIP/xxx.xxx.xxx.xxx-00001151”, “Received an unknown call with DID set to 9011441599690613”) in new stack
[Jan 10 21:07:01] VERBOSE[3979] pbx.c: – Executing [[email protected]:3] Goto(“SIP/xxx.xxx.xxx.xxx-00001151”, “s,a2”) in new stack
[Jan 10 21:07:01] VERBOSE[3979] pbx.c: – Goto (from-pstn,s,2)
[Jan 10 21:07:01] VERBOSE[3979] pbx.c: – Executing [[email protected]:2] Answer(“SIP/xxx.xxx.xxx.xxx-00001151”, “”) in new stack
[Jan 10 21:07:02] VERBOSE[3979] pbx.c: == Spawn extension (from-pstn, s, 2) exited non-zero on ‘SIP/xxx.xxx.xxx.xxx-00001151’
[Jan 10 21:07:02] VERBOSE[3979] pbx.c: – Executing [[email protected]:1] Hangup(“SIP/xxx.xxx.xxx.xxx-00001151”, “”) in new stack
[Jan 10 21:07:02] VERBOSE[3979] pbx.c: == Spawn extension (from-pstn, h, 1) exited non-zero on ‘SIP/xxx.xxx.xxx.xxx-00001151’
[Jan 10 21:07:24] VERBOSE[4004] manager.c: == Manager ‘admin’ logged on from 127.0.0.1
[Jan 10 21:07:25] VERBOSE[4004] manager.c: == Manager ‘admin’ logged off from 127.0.0.1
[Jan 10 21:08:11] VERBOSE[2929] netsock.c: == Using SIP RTP TOS bits 184
[Jan 10 21:08:11] VERBOSE[2929] netsock.c: == Using SIP RTP CoS mark 5
[Jan 10 21:08:11] VERBOSE[4053] pbx.c: – Executing [[email protected]:1] Set(“SIP/xxx.xxx.xxx.xxx-00001152”, “__FROM_DID=011441599690613”) in new stack
[Jan 10 21:08:11] VERBOSE[4053] pbx.c: – Executing [[email protected]:2] NoOp(“SIP/xxx.xxx.xxx.xxx-00001152”, “Received an unknown call with DID set to 011441599690613”) in new stack
[Jan 10 21:08:11] VERBOSE[4053] pbx.c: – Executing [[email protected]:3] Goto(“SIP/xxx.xxx.xxx.xxx-00001152”, “s,a2”) in new stack
[Jan 10 21:08:11] VERBOSE[4053] pbx.c: – Goto (from-pstn,s,2)
[Jan 10 21:08:11] VERBOSE[4053] pbx.c: – Executing [[email protected]:2] Answer(“SIP/xxx.xxx.xxx.xxx-00001152”, “”) in new stack
[Jan 10 21:08:12] VERBOSE[4053] pbx.c: == Spawn extension (from-pstn, s, 2) exited non-zero on ‘SIP/xxx.xxx.xxx.xxx-00001152’
[Jan 10 21:08:12] VERBOSE[4053] pbx.c: – Executing [[email protected]:1] Hangup(“SIP/xxx.xxx.xxx.xxx-00001152”, “”) in new stack
[Jan 10 21:08:12] VERBOSE[4053] pbx.c: == Spawn extension (from-pstn, h, 1) exited non-zero on ‘SIP/xxx.xxx.xxx.xxx-00001152’
[Jan 10 21:08:14] VERBOSE[2929] netsock.c: == Using SIP RTP TOS bits 184
[Jan 10 21:08:14] VERBOSE[2929] netsock.c: == Using SIP RTP CoS mark 5

Don’t accept anonymous calls?